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enginex-ascend-910-llama.cpp/ggml/src/ggml-vulkan/vulkan-shaders/mul_mat_vec_base.comp
Jeff Bolz 21c17b5bef vulkan: Use larger workgroups for mul_mat_vec when M is small (#15355)
* vulkan: Use larger workgroups for mul_mat_vec when M is small

Also use subgroup instructions for (part of) the reduction when supported.
Without this, the more expensive reductions would eat into the benefits of
the larger workgroups.

* update heuristic for amd/intel

Co-authored-by: 0cc4m <picard12@live.de>

---------

Co-authored-by: 0cc4m <picard12@live.de>
2025-08-17 18:08:57 +02:00

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#extension GL_EXT_control_flow_attributes : enable
#extension GL_EXT_shader_16bit_storage : require
#extension GL_EXT_shader_8bit_storage : require
#if USE_SUBGROUP_ADD
#extension GL_KHR_shader_subgroup_basic : require
#extension GL_KHR_shader_subgroup_arithmetic : require
#endif
#ifdef MUL_MAT_ID
#define EXPERT_COUNT 8
#endif
#include "types.comp"
layout (binding = 0) readonly buffer A {A_TYPE data_a[];};
layout (binding = 1) readonly buffer B {B_TYPE data_b[];};
layout (binding = 1) readonly buffer BV2 {B_TYPE_VEC2 data_b_v2[];};
layout (binding = 1) readonly buffer BV4 {B_TYPE_VEC4 data_b_v4[];};
layout (binding = 2) writeonly buffer D {D_TYPE data_d[];};
#ifdef MUL_MAT_ID
layout (binding = 3) readonly buffer IDS {int data_ids[];};
#endif
#include "dequant_funcs.comp"
layout (push_constant) uniform parameter
{
uint ncols;
uint stride_a;
uint stride_b;
uint stride_d;
uint batch_stride_a;
uint batch_stride_b;
uint batch_stride_d;
#ifdef MUL_MAT_ID
uint nei0;
uint ne11;
#else
uint ne02;
uint ne12;
uint broadcast2;
uint broadcast3;
#endif
} p;
void get_offsets(out uint a_offset, out uint b_offset, out uint d_offset) {
#ifdef MUL_MAT_ID
const uint expert_idx = gl_GlobalInvocationID.y;
#else
const uint batch_idx = gl_GlobalInvocationID.y;
#endif
#ifndef MUL_MAT_ID
uint batch_idx_a = 0;
if (batch_idx != 0) {
const uint i13 = batch_idx / p.ne12;
const uint i12 = batch_idx % p.ne12;
const uint i03 = i13 / p.broadcast3;
const uint i02 = i12 / p.broadcast2;
batch_idx_a = i03 * p.ne02 + i02;
}
#else
const uint expert_id = data_ids[expert_idx];
#endif
a_offset =
#ifdef MUL_MAT_ID
expert_id * p.batch_stride_a;
#else
batch_idx_a * p.batch_stride_a;
#endif
b_offset =
#ifdef MUL_MAT_ID
(expert_idx % p.ne11) * p.stride_b;
#else
batch_idx * p.batch_stride_b;
#endif
d_offset =
#ifdef MUL_MAT_ID
expert_idx * p.stride_d;
#else
batch_idx * p.batch_stride_d;
#endif
}
layout (constant_id = 0) const uint BLOCK_SIZE = 32;
layout (constant_id = 1) const uint NUM_ROWS = 1;
layout (constant_id = 2) const uint NUM_COLS = 1;
shared FLOAT_TYPE tmpsh[NUM_COLS][NUM_ROWS][BLOCK_SIZE];
void reduce_result(FLOAT_TYPE temp[NUM_COLS][NUM_ROWS], const in uint32_t d_offset, const in uint32_t first_row, const in uint32_t num_rows, const in uint32_t tid) {
// subgroupAdd is probably faster on devices that support it,
// particularly when the workgroup has more than one subgroup
#if USE_SUBGROUP_ADD
// sum up partial sums within a subgroup
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
temp[j][n] = subgroupAdd(temp[j][n]);
}
}
// Go through shared memory to sum partials across subgroups
if (gl_SubgroupInvocationID == 0) {
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
tmpsh[j][n][gl_SubgroupID] = temp[j][n];
}
}
}
barrier();
if (tid == 0) {
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
temp[j][n] = FLOAT_TYPE(0);
[[unroll]] for (uint s = 0; s < gl_NumSubgroups; ++s) {
temp[j][n] += tmpsh[j][n][s];
}
data_d[j*p.batch_stride_d + d_offset + first_row + n] = D_TYPE(temp[j][n]);
}
}
}
#else
// sum up partial sums and write back result
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
tmpsh[j][n][tid] = temp[j][n];
}
}
barrier();
[[unroll]] for (uint s = BLOCK_SIZE/2; s > 0; s >>= 1) {
if (tid < s) {
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
tmpsh[j][n][tid] += tmpsh[j][n][tid + s];
}
}
}
barrier();
}
if (tid == 0) {
[[unroll]] for (uint j = 0; j < NUM_COLS; ++j) {
[[unroll]] for (uint n = 0; n < num_rows; ++n) {
data_d[j*p.batch_stride_d + d_offset + first_row + n] = D_TYPE(tmpsh[j][n][0]);
}
}
}
#endif
}